JPS59155827A - Device having focusing rod lens array - Google Patents

Abstract

PURPOSE:To execute mapping of a light emitting body as a continuous image on a photosensitive medium by dividing one piece of rod lens array plate into two rod lens arrays by a face vertical to the optical axis direction, and providing them by putting in order the reference end and the direction of the reference surface of each rod lens array. CONSTITUTION:A, B and A', B' of rod lens arrays 31, 32 formed by dividing one rod array into two by a face vertical to the optical axis direction are the reference surface and the reference end, respectively, and X and Y show an array direction and a thickness direction, respectively. As for a distortion of such rod lens arrays 31, 32, they tend to cause the same distortion in the array direction X and the thickness direction Y, respectively, by putting in order the reference surfaces A, B and the reference ends A', B'. When a device is constituted by using such rod array lenses 31, 32, light emitted from plural light source bodies 21a, 21b, 22a and 22b arranged like an array are made to form ann erect image of an equal rate and unmagnification on a photosensitive medium 25 by the rod lens arrays 31, 32.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to an apparatus having a rod lens array that optically forms an incident light or an incident image into a positive image of equal magnification using a convergent rod lens array. It is related to.

(Prior art) Fig. 1 is a diagram showing an imaging optical system of a convergent rod lens (hereinafter referred to as rod lens), in which 11 is a 0-side lens, 1.2a is an object surface, and 12b, 12e *12d are incident surfaces. The light beams 13a, 13b, and 13c are optical system paths that pass through the rod lens II; 14a, 14b, and 14c are light beams emitted from the rod lens 11; The image plane 16 is the radius (height) of the rod lens.

In FIG. 1, light beams 12b, 12c', and 12d that exit from the object surface 12a and enter one end of the rod lens 11 are the rod L.
/7 In the lens 11, the optical path 7 J a + I 3b
Light rays 14a, 14b, 14 pass through the optical axis in a meandering manner as shown in r I J c and exit from the other end face.
The light image obtained by c forms an erect image 15h of equal proportion and magnification. Here, a convergent rod lens array (hereinafter referred to as a rod lens array) is one in which rod lenses are regularly arranged in an array.

FIG. 2 shows an example of a configuration using the present rod lens array; 'la, 21-b, 22a, and 22b are a plurality of light sources arranged in an array (example - LED array), 23Q2
4 is an O,..., L drain lens array, and 5 is a photosensitive medium.

1. A plurality of light source bodies 21a and 21b arranged in an array.

The light emitted from 22a and 22b forms an erect image of equal weight on a photosensitive medium 25 by separated rod lens arrays 23 and 24.

FIG. 3 is a plan view explaining the above-mentioned FIG. 2.
, 21b, 22a, 22b are light emitting element arrays, 23, 2
4 is a rod lens array, 25 is a photosensitive medium, 26a, 2
6b, 26c, and 26d are light source bodies 21a.

A projected image obtained by projecting the light from 22a, 21b, and 22b onto the photosensitive medium 25 by the rod lens arrays 23 and 24, where X is the array direction of the rod lens arrays 23 and 24, and Y is the light of the rod lens array. This is the thickness direction perpendicular to the axis. In such an imaging method, a plurality of light source bodies 21a, 2
Images 26a and 26b of the light emitted from 1b', 22a and 22b are projected onto the photosensitive medium 25.

26c and 26d, the projected image is the mouth, but due to minute discontinuities or distortions in the array form of the drain lens arrays 23 and 24, the projected image 26a-2
As shown in the connection part between 6b and the connection part between projection images 26b and 26c, the rod lens array 23.2 becomes an imaging type.
It is generated in both the array direction X of 4 and the height 7, and is projected and imaged discontinuously. In this way, when individual rod lens arrays having minute distortions are randomly combined as shown in FIG. .

FIGS. 4(a), (b), and (c) are diagrams showing the array-like distortion amount of each Halorad lens array. FIG. 4(a) shows an H rod lens array, in which the array direction of the mouth and drain lens arrays is the X direction, and the thickness direction of the rod lens array is the Y direction. Figure 4 (
In b), the vertical axis represents the amount of distortion from the measurement reference position in the Y direction, and the horizontal axis represents the X direction (length direction) of the rod lens array. In FIG. 4(C), the vertical axis represents the amount of distortion from the measurement reference position in the X direction, and the horizontal axis represents the X direction of the rod lens array. FIG. 5 shows an example of the imaging type that occurs when individual rod lens arrays having the distortion amounts shown in FIG. 4 are randomly combined as shown in FIG. 3. This imaging type, as shown in Fig. 4,
Although each distortion exists in the Y direction, here, for the sake of simplicity, the explanation will be given assuming that the rod lens array has distortion only in the Y direction.

FIG. 5(a) shows light source bodies 21a, 22a, 21b, 22b.
This shows the arrangement relationship seen in a two-dimensional view. Figure 5 (
b) Y-direction distortion jtf d 1 at each point in the X-direction of the id rod lens array 23 is shown. FIG. 5(c) shows the Y-direction distortion amount d2 at each point of the rod lens array 24 in the X-direction. Figure 5 (d
) is a projected image 26a formed on the photosensitive medium 25.

26b, 26c, and 26d, and the amount of imaging distortion at the normal imaging position. Here, the projected image 26
a and 26c are images obtained by forming images of light from the light sources 21h and 21b through the rod lens array 23, respectively, and projected images 26b and 26d are images of the light sources 22a' and 22b, respectively.
22b is formed into an image through the rod lens array 24. Now, Figure 5 (b) # (C)
When a projected image is formed by the rod lens array 23, 24 having a distortion At dl r d-2 as shown in FIG. Quantity d1.

The image is formed with a distortion of d2. Here, array direction X 1 in both rod lens arrays 23 and 24
Looking at the amount of imaging distortion at the + It becomes discontinuous at x3, and imaging types α, β, and γ occur at each position.

As explained above, the main cause of distortion is the uneven orientation of the optical axes of the rod lens array.

(Objective of the Invention) The object of the present invention is to bring these drawbacks to a microscopic range. Its basic feature is that one rod lens array is divided into two rod lens arrays of the same shape in a plane perpendicular to the optical axis direction, and the two divided rod lens arrays are placed in the same direction and on the same surface. The reason is that a reference end and a reference surface are provided and used. This will be explained below with reference to the drawings.

(Structure of the Invention) Fig. 6 shows a rod lens array plate divided into two rod lens arrays on a plane perpendicular to the optical axis direction, and a reference end and a reference on the same end face and the same plane. It has a surface. In Fig. 6, 31 and 32 are rod lens arrays obtained by dividing one rod lens array into two along a plane perpendicular to the optical axis direction, A, B, A/, and B/ are the reference plane and reference end, respectively, and X is the array. direction, Y6 thickness direction is shown. Two rod lens arrays 31 extracted as shown in Figure 6
By aligning the reference planes A and B and the reference ends A/ and Bt, the distortion of .degree. 32 is in the direction of 1, where the same distortion occurs in the array direction X and the thickness direction Y, respectively.

FIG. 7 shows the imaging distortion in the Y direction in the array direction when the rod lens arrays 31 and 32 divided as shown in FIG. 6 are constructed as shown in FIG. 3. Here, the description will be made assuming that the rod lens array has distortion only in the Y direction, as in FIG. 5 described above. FIG. 7(a) shows light source bodies 21a and 22a.

This shows the arrangement relationship between 21b and 22b when viewed from above. FIG. 7(b) shows the Y-direction distortion i d 3 at each point in the X-direction of the rod lens array 31. FIG. 7(c) shows the Y-direction strain meter d4 at each point in the X-direction of the rod lens array 32. FIG. 7(d) shows projected images 26a and 2 formed on the photosensitive medium 25.
6b, 26c, 26d, and the normal imaging position (0
It shows the amount of imaging distortion on the line shown by ).

As is clear from FIGS. 7(b) and 7(c), the Y-direction distortion characteristics of the rod lens arrays 31 and 32 are almost the same.

Still, the projected images 26a and 26c are images formed by focusing the light from the light sources 21a and 21b through the rod lens array 31, and the projected images 26b and 26d are formed by focusing the light from the light sources 22a and 22b, respectively. The image is formed through the rod lens array 32. These rod lens arrays 31 and 32 are arranged at reference ends A/, as shown in FIG.
B/ are aligned, and reference planes A and B are also aligned in the same direction.

As shown in this figure, by aligning the reference planes A and B and the reference ends AI and B/, the Y-direction distortion d3+ of the rod lens array can be reduced.
d4 shows the same trend. Therefore, array direction X, r
Imaging distortion on X 2 + X 3 is imaged within an extremely small range. Therefore, when using a rod lens array, consideration should be given to aligning the base planes A and B and the reference ends A/ and B/.

Above, we have described the case where the distortion in the Y direction of the rod lens array is removed, but the distortion in the array direction of the rod lens array, that is, in the Therefore, it is also removed.

FIG. 8 shows an example constructed using the rod lens array extracted from FIG. 6.

In FIG. 8, 21aI21b, 22a, 22b are a plurality of light sources arranged in an array, 31.32 is a rod lens array, 25 is a photosensitive medium, A and B are reference planes of the rod lens array 31.32, and A '.

B' indicates the reference end of the rod lens array 31, 32, X indicates the array direction, and Y indicates the thickness direction.

Now, a plurality of light source bodies 21a are arranged in an array.

The left beams emitted from 21b, 22a, and 22b are imaged by rod lens arrays 31 and 32 onto a photosensitive medium 25 as a positive image of equal weight tube magnification.

Note that it is possible to adjust the angle formed by the two rod lens arrays or the focal direction of each rod lens array using an adjustment mechanism (not shown), so that the projected images of each rod lens array can be easily continuously displayed on a photosensitive medium. It forms a clear image.

Although the case where two rod lens arrays are used in parallel has been described above, the present invention is not limited to this, and a plurality of rod lens arrays such as three or four rod lens arrays can be used in parallel.

(Effects of the Invention) According to the present invention, the reference planes A and B and the reference ends A/ and n/ of the rod lens arrays 31 and 32 are combined in the same direction. Therefore, when trying to form an image on a straight line, the rod lens arrays 31 and 32 move in the 7-ray direction
Alternatively, even if there is a slight distortion in the thickness direction Y, the normal positions of the rod lens arrays 31 and 32 are the same, so
According to the imaging principle of the rod lens shown in FIG. 1, the imaging distortion of each of the rod lens arrays 31 and 32 is
It is possible to form an image within a microscopic range very easily in one thickness direction Y.

As explained above, the present invention maps light emitters arranged at equal pitches in a straight line onto a photosensitive medium as a continuous image, and can be used in optical printers, etc., but this principle can also be applied to reading devices. can. That is, a linear light-receiving array is used as a replacement for the linear light emitter, and a read image or a document is placed as a replacement for the photosensitive medium. However, by using the rod lens array of the present invention and by irradiating the document surface with a linear light source such as a fluorescent lamp, the document image can be continuously received by the light receiving array.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the imaging principle of a through rod lens that forms an erect image with equal weight tube times, Figure 2 is a configuration diagram of a randomly combined mouth and drain lens array, and Figure 3 is a plan view of FIG. 2, FIG. 4 is a diagram showing array distortion occurring within the rod lens array, and FIG. 5 is a diagram of an example of the imaging type caused by combining the rod lens array distortions. , Fig. 6 is a diagram of the rod lens array divided into two on a plane perpendicular to the optical axis direction, Fig. 7 is a diagram showing an example of image formation of the rod lens array extracted from Fig. 6, and Fig. 8 1 is a diagram showing an embodiment of the present invention. 21a, 21b, 22a, 22b; light source, 2s, 2
4; rod lens array, 25: photosensitive medium, 31;
, -s2; rod lens array. Figure 1 Figure 2 Figure 6 Figure 4 Loaf V Lens Array Cylindrical tube with a rhinoceros tube

Claims (1)

[Scope of Claims] A linear light source, a plurality of convergent rod lens arrays that optically image the linear light source into an erect image of an isograft tube magnification,
and a photoreceptor for recording or storing an optical image projected by the convergent rod lens array, wherein the rod lens array has one rod lens array plate arranged in a plane perpendicular to its optical axis to form a plurality of identically shaped pieces. 1. An apparatus having a convergent rod lens array, characterized in that the rod lens array is divided into rod lens arrays, and the reference ends and reference surfaces of each rod lens array are arranged in the same direction.